Hi all, I am still working on second derivative tests having trouble with finding the critical points.
The problem is find the critical points of f(x,y)=sinx+siny+cos(x+y) for x between 0 and pie/4 and y between 0 and pie/4. Classify each as a local min, max, or saddle point.
f(x,y)=sinx+siny+cos(x+y)
I found the partials to be:
derivative of f with respect to x = fx=cosx-sin(x+y)
derivative of f with respect to y = fy=cosy-sin(x+y)
I am having trouble solving the partials for 0.

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